s*****t
发帖数: 1994 | 1 The Colors and Mysteries of Centaurus A
Credit: X-ray (NASA/CXC/M. Karovska et al.); Radio 21-cm image
(NRAO/VLA/Schiminovich, et al.),
Radio continuum image (NRAO/VLA/J.Condon et al.); Optical (Digitized Sky Survey, U.K.
Schmidt Image/ STScI)
Explanation: Why is spiral galaxy Centaurus A in so much turmoil? The above composite
image shows different clues to the unusual galaxy's past in different bands of light. In low
energy radio waves, sh |
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d*****r
发帖数: 2583 | 2 Brain science is different from other science, in a fundamental way:
"If the brain were so simple we could understand it, we would be so simple
we couldn't."
"understanding brain" itself is a brain process, then it will become "
understanding understanding brain" is also a brain process... you will fall
into infinitive loop.
That's why I kind of agree there're some questions human will never have
answers, like the Continuum hypothesis in Math. The best catch is we finally
prove that we can neve... 阅读全帖 |
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t*****c
发帖数: 36 | 4 错误提示信息是什么？
你装limix是用系统自带的python还是其它后来装的环境？
个人使用经验是不要去动系统自带的python, 装一个Anaconda（https://store.
continuum.io/cshop/anaconda/）， 然后用Anaconda来安装管理需要的包。有一些包
用pip等方式很难安装，你可以在anaconda里搜搜看有没有已经编译好了的。 |
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发帖数: 1 | 5 Research misconduct - The grey area of Questionable Research Practices
We all know that fabrication, falsification and plagiarism fall under the
definition of research misconduct. However, the VIB definition of research
misconduct is broader than that. It also includes practices “that seriously
deviate from those that are commonly accepted within the scientific
community for proposing, conducting or reporting research.”
VIB guidelines and recommendations
There is a continuum from truly correct t... 阅读全帖 |
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g*****1
发帖数: 54 | 6 Dielectric effects in biopolymers: The theory of ionic saturation revisited
(p 427-439)
B. E. Hingerty, R. H. Ritchie, T. L. Ferrell, J. E. Turner
Published Online: Feb 1 2004 11:10PM
DOI: 10.1002/bip.360240302
Continuum radial dielectric functions for ion and dipole solution systems
Journal of Computational Chemistry
Volume 10, Issue 1, Date: January/February 1989, Pages: 77-93
S. Ehrenson
Thanks!
j***********[email protected] |
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r*****h
发帖数: 61 | 7 On the Performance of Continuum Solvation Methods. A
Comment on “Universal Approaches to Solvation Modeling”, Acc. Chem. Res.,
2009, 42 (4) 480-492, Klamt坐不住了。
Reply to Comment on “A Universal Approach to Solvation Modeling”,Acc. Chem
. Res., 2009, 42 (4), 493-497 Truhlar同学回帖。 |
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c******x
发帖数: 438 | 8 I know a lot of papers I am asking, Thanks in advance.
1. Comparison of hyperelastic models for rubber-like materials
MARCKMANN G. (1) ; VERRON E. (1) ;
Rubber chemistry and technology, 2006, vol. 79, no5, pp. 835-858 [24 page(s)
(article)] (74 ref.)
2.Constitutive equations for amended non-Gaussian network models of rubber
elasticity
Alex Elías-Zúñiga, a and Millard F. Beatty
International Journal of Engineering Science
Volume 40, Issue 20, December 2002, Pages 2265-2294
3.Modeling hyper... 阅读全帖 |
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v*****s
发帖数: 20290 | 9 不好弄，你的这个散射峰其实已经未必是瑞利散射峰了。如果你光谱仪的入射角没有问
题，或者说真的在550nm有这个wing，那什么filter都滤不掉，因为本身频率就一样，
怎么滤？当然保险起见，先上至少两个530的ultra-steep long-pass filter再说，最
好是有两个notch filter。
比较有希望的办法是在入射样品之前，上narrow band-pass filter把你的laser line
好好滤滤。diode laser本身的频谱经常比较宽，你不注意看不出来，但是用来测弱荧
光和拉曼的时候很容易淹没信号。
或者就是数据处理的时候，想点办法，因为荧光应该是个相对比较窄的峰，散射峰的
wing是比较平缓的基线。
最后的办法就是换载体吧，搞不好你的载体本身有比较强的raman continuum或者
photoluminescence（不过那样的话，不太可能下延到350nm）。
500nm |
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j****x
发帖数: 943 | 11 我Phd学的是bioengineering，做的是计算流体方面的research。自己对scientific
computation 如 continuum mechanics， MD等方面都很有兴趣。可是因为phd专业的关
系，想找个computation方面的postdoc也不容易，而且也觉得自己在这方面的training
很不够。有时候觉得做postdoc折腾，还不如正经念个computation方面的phd。不知道
选什么系比较合适？ 是学cs呢haishi应用数学？了解的高人给出出主意，多谢了。 |
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k*********g
发帖数: 791 | 12 canonical definitions of galerkin methods and collocations methods.
the definition of galerkin methods vary in different communities of
scientific computing.
since spectral-based methods will be the future of numerical computation for
continuum, the canonical definition of galerkin sort of follows the bible "
C. Canuto, M. Y. Hussaini, A. Quarteroni, and T. A. Zang. Spectral Methods,
Fundamentals in Single Domains. Springer-Verlag, 2006":
if the core computation is conducted in the transformed s... 阅读全帖 |
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U*****e
发帖数: 2882 | 13 This is constructive.
In light of your suggestions, I agree in the case of monopoly (or
oligopoly), both fixed and total costs should be normalized. In the case
of continuum of firms, then only aggregate fixed or total costs are
normalized, while individual costs must not be normalized.
As there are models about one dominant firm and many price-taking small
firms, things could be worse.
variable |
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s*****a
发帖数: 353 | 14 When you have a continuum of firms, I believe the costs are not normalized,
but you can still assume the measure of number of firms is 1, as what you
did for consumers.
This technique, I believe, works for an arbitrary number of firms.
Actually think of it this way, in most of the macro models, we talk about
the average variables, like average capital per capita, etc. There we are
doing virtually the same thing: normalize everything so that it corresponds
to only one person, and we are free to t |
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y********4
发帖数: 1116 | 15 Two research assistant and one postdoc positions are immediately available
in the Micro/nanoscale Transport Lab at the University of South Carolina.
1. Flow boiling in microchannels: design & fabricate novel micro/nano-
structures in microchannels to regulate flow boiling regimes, characterize
flow boiling, and develop mechanistic thermo-hydraulic models to predict
heat transfer rate, pressure drop, and CHF.
2. Heat pipe experiment and modeling: design, fabricate, and characterize
novel hy... 阅读全帖 |
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c*******h
发帖数: 1096 | 16 the set of limit points of a sequence consists either of a single point or a
continuum |
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h***u
发帖数: 498 | 17 请大家推荐 continuum mechanics 方面比较好的英文教材
入门的，适于工科基础的，比较经典的。
谢谢 |
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s*******n
发帖数: 38 | 18 不是搞力学的，但听说好像Lai的introduction to continuum mechanics不错。 |
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w*q
发帖数: 1544 | 19 Antman
Distinguished University Professor, Joint/Mathematics
Continuum Physics and Nonlinear Analysis |
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b**g
发帖数: 335 | 20
which
If you know some algebra, then you should have heard of field extension, i.e.
given a field F, insert something, say, x, to create a new field F[x]
Similarly, begin with a model of axiomatic set theory (e.g. ZFC), say M,
insert
something, say G (G means "generic" set), to it. This G is specially
chosen such that M[G] is still a model of ZFC but violates continuum
hypothesis. (Note: this model M is also special, it has to be countable &
transitive)
This whole process (called "forcing") is |
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D******n
发帖数: 2965 | 21 请问 单调函数（mapping R to R, monotone）的 cardinality 是多少？
我自己证了下，觉得应该是 c，（the cardinality of the continuum）, 但是不确定
对错，查了查文献，居然google scholar也找不出，觉得很奇怪。 这应该是一个比较
标准的问题，怎么会查不到文献呢？
请问哪位大牛帮下忙啊，多谢了。 |
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x********i
发帖数: 905 | 22 http://iccm.mcm.ac.cn/dct/page/1
Plenary Lectures
Group 1
Wei Zhang: RTF and L-functions
Kai-Wen Lan: Cohomology of automorphic bundles
Xinyi Yuan: On Faltings heights of CM abelian varieties
Jing Yu: On Linear Independence of Logarithms
Xuhua He: Cocenter of Hecke algebras
Jiu-Kang Yu: A GAGA theorem for p-adic groups
Jianya Liu: Manin's conjecture for a class of singular cubic
hypersurfaces
Lei Fu: Rigidity of $ell$-adic Sheaves
Si Li: Open-closed topologica... 阅读全帖 |
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x********i
发帖数: 905 | 23 http://iccm.mcm.ac.cn/dct/page/1
Invited Lectures
Group 1
Fan Qin: Cluster algebras and monoidal categorification
Fang Li: Positivity of acyclic sign-skew-symmetric cluster algebras via
unfolding method and some related topics
Cheng-Chiang Tsai: An attempt for affine Springer theory
Li Cai: The Gross-Zagier formula: arithmetic applications
Ming-Hsuan Kang: Geometric zeta functions on reductive groups over non-
archimedean local fields
Huanchen Bao: Canonical bases arising... 阅读全帖 |
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f*********e
发帖数: 71 | 24 6 科学与工程的一门学科
从《Applied Mechanics Reviews》的“学科分类主索引”中可以看出应用力学既是一门
科学
学科又是一门工程学科. AMR是ASME出版的月刊，它检索了与应用力学相关的500多本国际
性刊物
上的数千篇研究论文. 1990年，AMR将应用力学分为10类，如表7所示, 标题偶有变更.每
一大类又
分为许多类，从4至25不等. 许多门类还是工程院校研究生课程的名称，或者是专业期刊
的名称，
如《International Journal of Multiphase Flow》、《Journal of
Elasticity》、《Journal
of Composite Materials》和《Journal of Biomechanics》.
表7 应用力学学科分类*
I．基础和基本方法(Foundation and Basic
Methods)
连续介质力学(continuum mechanics)
有限元法(finite element methods)
有限差分法(finite difference methods)
其他计算方法(other |
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s***k
发帖数: 2754 | 25 What is the shear elastic strain energy?
How to express it by deviatory stress tensor?
For linearly elastic and ideal-plastic solids,
total energy per unit volume includes three parts,
they are internal energy per unit mass,
kinetic energy per unit mass,
and shear elastic strain energy.
With this total energy per unit volume,
when one try to equalize the energy conservation equation
in solid dynamics and energy conservation equation
in continuum mechanics, what is the necessary additional
Thanks |
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m********e
发帖数: 5088 | 26 我就是做这个方面的东西，感觉没有太大的前景。好处就是文章比较好发，这可能也是现
在nanomech比较时髦。但实际上做mechanics都是建立在连续介质假设上的，在nano-
scale下，continuum assumption本来就不成立，很多情况下都是要用到atomic
simulation,这方面我们又做不过computation chemistry方面的人了。
所以阿，我看nanomech只是找了个学术方面的盲点，发了一堆有用无用的东西而已。
工业界应用为0。除非大公司的顶级研究机构，不然很难找到opening。
学术界还行，力学方面招faculty就是招这个方向的。
。 |
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a***n
发帖数: 53 | 27 Hi, my advisor let me look for two Ph.D students for his new NASA and Airforce
sponsored projects. The starting date will be August, 2006. And candidates
with late availability such as Spring 2007 can also be considered.
One student will work on developing new, updated global-local finite element
modeling methods for crack growth simulations. This student should have a
strong background in solid mechanics (e.g. continuum mechanics, plasticity)
and finite element methods (familiarity with commerc |
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b*******e
发帖数: 74 | 28 我是06年毕业的Ph.D.力学方向，论文是做本构关系的，非常地理论化，用的主要是
continuum mechanics 和大量的数学方面的知识。自己觉得强项在于理论的背景很强，
弱项是没有什么实际经验，没有做过什么和工业界有关的项目。每每到working
experience 部分，就会很头疼，因为只有 TA/RA 的经验。自己为了有一些卖点，倒是
学了些实用的软件，可是却只是做了些tutorial 的东西，也不知上哪里去找一些大一
些的projects 好使自己的简历更有吸引力。另外，似乎也很难可以把这个和我的
research 联系起来。
我不知道我的这个力学背景，可以找什么方向的工作，mechanical design, structral
analysis, or stress analysis? 和这些方向都有些什么差距？
非常感谢您的意见和建议！ |
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a******n
发帖数: 98 | 29 linear lagrangian strain: Lij=(Ui,j+Uj,i)/2
eulerian strain is related to the time change, can not remember the
definition
对于2维的E和e，如何转换呢？tensor operation
find a bood of Continuum Mechanics and it should have the definition and
relation |
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h***u
发帖数: 498 | 30 请大家推荐 continuum mechanics 方面比较好的英文教材
入门的，适于工科基础的，比较经典的。
谢谢 |
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B***G
发帖数: 3 | 31 我是北大力学系学复合材料的.看到continuum mechanics好熟悉亚! |
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a****n
发帖数: 1119 | 32 elements of continuum mechanics
Romesh C. Batra
ISBN: 1-56347-699-1 |
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s*********e
发帖数: 97 | 33 Material modeling is very intensive in terms of FE methods, math!!!,
continuum mechanics, computer science (programming).
temperature dependency,
strain rate dependency,
size dependency,
theory, testing, standards for above fields.
nobody is good enough to cover all these.
==================
after that,
If your theory could be within a good trend, and promoted by your R&D and
you could be really happy.
but very tough job. permanent head damage! |
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m****n
发帖数: 293 | 34 Please google "Continuum Damage Mechanics", I think this will help you find
a solution. I have a lot of papers in the field at hand. Please let me
know if you need them.
damage
delam/
久。 |
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m***i
发帖数: 88 | 35 I am from Thermal/fluid background (took some undergraduate Solid Mechanics
and Mechanics and Dynamics in China). I am wondering what are most popular
English textbooks on solid mechanics (undergraduate level). I would like to
expand my skill set in this area. I already have a few FEA books, which are
not very useful to build up engineering sense. Searched JHQ and previous
posts and found no records.
Thanks a lot. |
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b*******l
发帖数: 591 | 36 if your university has access to springer online, most probably you can
freely download many e-books on any subjects.
they have many mechanics-related books.
Mechanics
to
are |
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s********r
发帖数: 257 | 37 I use these two:
(1) Y.C. Fung & Pin Tong
Classical and computational solid mechanics
This book is easy to read.
(2)Issam Doghri
Mechanics of Deformable solids
Both of them can be used for FEA. |
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j****x
发帖数: 943 | 38 Not sure. I'm more into the continuum stuff. For porous media, when I
looked at so many integration stuff, I just felt dizzy. |
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w*********h
发帖数: 664 | 39 我也收到猎头的电话了
此人联系方式是
Ryan Urban
Work: 732-447-1232 E-mail: r****[email protected]
具体内容如下
FEA Engineer Job Description
Looking for a development engineer to perform advanced finite element analys
is for solution of complex structural problems related to development of eme
rgency slide systems.
This individual acts as the primary FEA analyst for the company, therefore r
equiring a very solid understanding of FEA functions, such as modelling, mes
hing, element limitations, setting of boundary conditions,... 阅读全帖 |
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c*****c
发帖数: 60 | 40 A faculty at Mechanical, Materials and Aerospace Engineering Department of
Illinois Institute of Technology (located in Chicago, US) is looking for a
Ph.D student (starting from Spring 2014), who is interested in the research
work in laser-material interactions and laser-based manufacturing and
materials processing. If you are interested, please email your short resume
and un-official transcripts to him at: b***[email protected].
Highly-motivated students with strong backgrounds in one or several areas... 阅读全帖 |
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y********4
发帖数: 1116 | 41 Two research assistant and one postdoc positions are immediately available
in the Micro/nanoscale Transport Lab at the University of South Carolina.
1. Flow boiling in microchannels: design & fabricate novel micro/nano-
structures in microchannels to regulate flow boiling regimes, characterize
flow boiling, and develop mechanistic thermo-hydraulic models to predict
heat transfer rate, pressure drop, and CHF.
2. Heat pipe experiment and modeling: design, fabricate, and characterize
novel hy... 阅读全帖 |
|
t**********6
发帖数: 565 | 42 前段时间在弯曲(San Francisco) 附近找工作，自己也整理了一些找机械背景的公司。
现在尘埃落定，跟大家分享一下，希望起到帮助。题目起的，是吸引眼球，我承认。。。
斑竹，也看着给个包子：）
也欢迎大家添砖加瓦，完善这个列表。
弯曲总体上自然是马公的天下，但是仔细找找，机械工作的机会并不比别的区域少。当
然，传统的机械公司不多，主要集中在消费电子业，半导体，医疗器械，新能源等领域
。下面这个表是我自己整理的，如有疏忽之处，大家也多提意见。
Consumer Electronics (including electronics component supplier)
1. Apple
2. Nest
3. Amazon Lab126 – Kindle Fire
4. GoPro – Camera mounting Company.
5. Dell, San Jose, CA
6. HP
7. Logitech
8. Sandisk
9. Western Digital – Date Storage, FEA
10. In... 阅读全帖 |
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t**********6
发帖数: 565 | 43 前段时间在弯曲(San Francisco) 附近找工作，自己也整理了一些找机械背景的公司。
现在尘埃落定，跟大家分享一下，希望起到帮助。题目起的，是吸引眼球，我承认。。。
斑竹，也看着给个包子：）
也欢迎大家添砖加瓦，完善这个列表。
弯曲总体上自然是马公的天下，但是仔细找找，机械工作的机会并不比别的区域少。当
然，传统的机械公司不多，主要集中在消费电子业，半导体，医疗器械，新能源等领域
。下面这个表是我自己整理的，如有疏忽之处，大家也多提意见。
Consumer Electronics (including electronics component supplier)
1. Apple
2. Nest(part of Google) + Google
3. Amazon Lab126 – Kindle Fire
4. GoPro – Camera mounting Company.
5. Dell, San Jose, CA
6. HP
7. Logitech
8. Sandisk
9. Western Digital – Da... 阅读全帖 |
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t*****r
发帖数: 1765 | 44 “I have checked in all NYC and nobody is offering sponsorship now, at least
not that I know of. The continuum partners (beth israel, roosevelt, st.
luke hospital, etc) say on their website that they do, but in reality they
don't. I know because I had an interview with roosevelt hospital and had to
reject the position at the end because they do not offer sponsorship. But
then a woman from human resources told me perhaps Good Samaritan Hospital in
Long Island, and also South Hampton Hospital offer |
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f******u
发帖数: 57 | 45 我知道good smaritan hospital，是catholic network的医院，这个天主教的医院系统
在长岛是很大的，包括很多医院。不过这个GS，回信巨慢，1个月没有回音都很正常。
不知道办不办，认识好多那里的护士，没听他们说过。不过很多人想进去，都是住附近
的美国人。 所以也不是很好进。他们是magnet的，开车要一个小时（从QUEENS）。那
个continuum的，原来是办绿卡的，不过很刁，一般要有美国经验才考虑你。我认识2个
MM， 就是他们办的。不过现在去都不用去了，没有名额 |
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R******y
发帖数: 651 | 48 用量子力学的观点看.lattice model 的 Hamiltonian 一定要在 continuum limit 等于
continuous model 吗？ |
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b****r
发帖数: 2555 | 49 This is pretty standard ps-OPA set-up.
I would suggest you use a pulse energy meter (I am using one from Laser
Probe),
which can give you the average, standard variation, etc., of your pulse
energy. Those are useful information for OPA alignment.
Spatial non-uniformity is mostly due to miss-alignment. I would suggest
you first check your white super-continuum, it should be a co-centered
ring with different colors - and in most case you won't get that (I never
get that), but you should do the bes |
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